Origin: 1830–40; < F < It sottana, fem. of sottano placed below, equiv. to sott(o) below (< L subtus) + -ano-an; form of the F word influenced by sous under
sou·tane (sōō-tän', -tān') n. A cassock, especially one that buttons up and down the front.
[French, alteration (influenced by French sous, under) of obsolete sottane, from Italian sottana, from sotto, under, from Latin subtus, from sub; see upo in Indo-European roots.]